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Lab Manual for Moffitt-Long and Mount Zion

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Bleeding Time

Item Value
Approval req'd? Yes, contact Hematology at x3-1747. All requests will be reviewed except those Bleeding Times ordered in association with a Platelet Aggregation study.

The Bleeding Time is only availabe as a pre-scheduled test ordered by a Hematologist.
Available Stat? No
Test code BT
Performed by Parnassus Hematology
In House Availability Test run 0800-1500 Monday-Friday.
Collection Instructions By appointment only, contact Hematology at x3-1747. Performed by laboratory technologist.
Container type
Sample type
Units Minutes (min)
Normal range
Age Normal
0-4 months old < 3 min
> 4 months old < 11 min
Synonyms Ivy bleeding time; Template bleeding time; Aspirin tolerance test; ASA tolerance test
Turn around times 4 hours
Additional information The bleeding time may be useful in conjunction with platelet aggregometry to establish a diagnosis of a hereditary platelet function disorder. However, 50-65% of individuals with hereditary platelet function disorders may have normal bleeding times (Br J Haematol. 1979 Dec;43(4):649-59; J Thromb Haemost. 2004 Jun;2(6):892-8).

An aspirin tolerance test may be performed in individuals undergoing platelet aggregation who exhibit normal bleeding times. The aspirin tolerance test (bleeding time performed after aspirin ingestion) increases the sensitivity of the bleeding time to hereditary platelet function disorders.

Bleeding time and aspirin tolerance test results contribute to diagnosis of bleeding diathesis in correlation with platelet aggregations studies, hematocrit, platelet count, medical illnesses, medications & nutriceuticals, as well as personal and family bleeding history.

The test is not intended for assessing bleeding risk, and is a poor predictor of bleeding in patients who are undergoing invasive procedures or surgery and who do not have a history of bleeding.
LOINC code 11067-6
Last Updated 4/5/2013 12:57:51 PM
Entry Number 122
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